Check if other page field value is empty using jquery or javascript

I'm getting all contacts from Mysql db and then showing it on html row. Each row has onClick() method After click on each row it will show a details of contact to the right side of all contacts. This getDetails() call the [url removed, login to view] (Contact Details) page. In this page I've a field called Note where user can enter [url removed, login to view] now I want to show a Confirm message to the user Only if user write something on Enter Note box but click other row (all contacts) without save this Enter Notes

Confirm mesaage will be : Do you want to save this Notes box before you go to other Contact ? Yes Or No. If Yes then saveNote() will be call otherwise it will load the new contact row.

Hi,
Understanding:
Need to work with jQuery
When user enter NOTE in textbox and if click on another contact details, need 1st confirmation from user for save or not that NOTE
I can do this job
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we build more then 100 php/mysql projects
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